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LSGM계 고체산화물 연료전지의 전해질-음극 사이의 계면안정성
김광년,문주호,손지원,김주선,이해원,이종호,김병국,Kim, Kwang-Nyeon,Moon, Jooho,Son, Ji-Won,Kim, Joosun,Lee, Hae-Weon,Lee, Jong-Ho,Kim, Byung-Kook 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.7
Interfacial reactions at LSGM electrolyte and NiO-GDC anode interfaces were thoroughly investigated with Environmental Scanning Electron Microscopy (ESEM-PHlLIPS XL-30) and Energy Dispersive X-ray (EDX-Link XL30). According to the analysis, serious reaction zone was observed at LSGM/NiO-GDC interface. It was found that the reaction layer was originated from the chemical reaction between NiO and LSGM. The reaction products were identified as La deficient form of LSGM based perovskite and Ni-La-O compounds such as LaSrGa$_{3}$O$_{7}$ and LaNiO$_{3}$ from the X-Ray Diffraction (XRD, Philips) analysis. According to the electrical characterization, interfacial layer was very electrically resistive which would be the cause of high internal resistance and low power generating characteristic of the unit cell.
LSGM계 고체산화물 연료전지의 계면안정성을 위한 완층층의 도입
김광년,문주호,손지원,김주선,이해원,이종호,김병국,Kim, Kwang-Nyeon,Moon, Jooho,Son, Ji-Won,Kim, Joosun,Lee, Hae-Weon,Lee, Jong-Ho,Kim, Byung-Kook 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.9
In order to find a proper buffering material which can prohibit an unwanted interfacial reaction between anode and electrolyte of LSGM-based SOFC, we examined a gadolinium doped ceria and scandium doped zirconia as a candidate. For this examination, we investigated the microstructural and phase stability of the interface under different buffering layer conditions. According to the investigation, ceria based material induced a serious La diffusion out of the LSGM electrolyte resulted in the formation of very resistive $LaSrGa_3O_7$ phase at the interface. On the other hand zirconia based material was directly reacted with LSGM electrolyte and thus produced very resistive reaction products such as $La_2Zr_2O_7,\;Sr_2ZrO_4,\;LaSrGaO_4\;and\;LaSrGa_3O_7$. From this study we found that an improper buffering material induced the higher internal cell resistance rather than an interfacial stability.
LSGM계 고체산화물 연료전지의 전기화학적 성능에 미치는 계면반응층의 영향
김광년,문주호,김형철,손지원,김주선,이해원,이종호,김병국,Kim, Kwang-Nyeon,Moon, Jooho,Kim, Hyoungchul,Son, Ji-Won,Kim, Joosun,Lee, Hae-Weon,Lee, Jong-Ho,Kim, Byung-Kook 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.10
LSGM is known to show very serious interfacial reaction with other unit cell components, such as electrode, electrode functional or buffering layers. Especially, the formation of very resistive LaSr$Ga_{3}$$O_{7}$ phase at the interface of an anode and an electrolyte is the most problematic one in LSGM-based SOFCs. In this study, we investigated the interfacial reactions in LSGM-based SOFCs under different unit cell configurations. According to the microstructural analysis on the interfacial layer between an electrolyte and its neighboring component, serious interfacial reaction zone was observed. From the electrical and electrochemical characterization of the cell, we found such an interfacial reaction zone not only increased the internal ohmic resistance but also decreased the OCV(Open Cell Voltage) of the unit cell, and thus consequently deteriorated the unit cell performance.
전자빔 물리증착을 이용한 고체 산화물 연료전지의 제조: II. 단전지 성능
김형철,박종구,정화영,손지원,김주선,이해원,이종호,Kim, Hyoung-Chul,Park, Jong-Ku,Jung, Hwa-Young,Son, Ji-Won,Kim, Joo-Sun,Lee, Hae-Weon,Lee, Jong-Ho 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.5
In this paper, anode supported SOFC with columnar structured YSZ electrolyte was fabricated via Electron Beam Physical Vapor Deposition (EBPVD) method. Liquid condensation process was employed for the preparation of NiO-YSZ substrate and the high power electron beam deposition method was used for the deposition of YSZ electrolyte film. Double layered cathode with LSM-YSZ and LSM was printed on electrolyte via screen-printing method and fired at $1150^{\circ}C$ in air atmosphere for 3 h. The electrochemical performance and the long-term stability of $5{\times}5cm^2$ single cell were investigated with DC current-voltage characteristics and AC-impedance spectroscopy. According to the investigation, $5{\times}5cm^2$ sized unit cell showed the maximum power density of around $0.76W/cm^2$ at $800^{\circ}C$ and maintained the stable performance over 400 h.
BaCeO<sub>3</sub>-BaZrO<sub>3</sub> 고용체(BCZY) 기반 프로톤 세라믹 연료전지(PCFC)용 고성능 전해질 개발
안혁순,신동욱,최성민,이종호,손지원,김병국,제해준,이해원,윤경중,An, Hyegsoon,Shin, Dongwook,Choi, Sung Min,Lee, Jong-Ho,Son, Ji-Won,Kim, Byung-Kook,Je, Hae June,Lee, Hae-Weon,Yoon, Kyung Joong 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
To overcome the limitations of the solid oxide fuel cells (SOFCs) due to the high temperature operation, there has been increasing interest in proton conducting fuel cells (PCFCs) for reduction of the operating temperature to the intermediate temperature range. In present work, the perovskite $BaCe_{0.85-x}Zr_xY_{0.15}O_{3-\delta}$ (BCZY, x = 0.1, 0.3, 0.5, and 0.7) were synthesized via solid state reaction (SSR) and adopted as an electrolyte materials for PCFCs. Powder characteristics were examined using X-ray diffraction (XRD), thermogravimetric analysis (TGA) and Brunauer, Emmett and Teller (BET) surface area analysis. Single phase BCZY were obtained in all compositions, and chemical stability was improved with increasing Zr content. Anode-supported cell with $Ni-BaCe_{0.55}Z_{0.3}Y_{0.15}O_{3-\delta}$ (BCZY3) anode, BCZY3 electrolyte and BCZY3-$Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-\delta}$ (BSCF) composite cathode was fabricated and electrochemically characterized. Open-circuit voltage (OCV) was 1.05 V, and peak power density of 370 ($mW/cm^2$) was achieved at $650^{\circ}C$.
LSGM계 음극지지형 고체산화물 연료전지에 적용된 LDC 완충층의 효과
송은화,정태주,김혜령,손지원,김병국,이종호,이해원,Song, Eun-Hwa,Chung, Tai-Joo,Kim, Hae-Ryoung,Son, Ji-Won,Kim, Byung-Kook,Lee, Jong-Ho,Lee, Hae-Weon 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.12
LSGM$(La_{0.8}Sr_{0.2}Ga_{0.8}Mg_{0.2}O_{3-{\delta}})$ is the very promising electrolyte material for lower-temperature operation of SOFCs, especially when realized in anode-supported cells. But it is notorious for reacting with other cell components and resulting in the highly resistive reaction phases detrimental to cell performance. LDC$(La_{0.4}Ce_{0.6}O_{1.8})$, which is known to keep the interfacial stability between LSGM electrolyte and anode, was adopted in the anode-supported cell, and its effect on the interfacial reactivity and electrochemical performance of the cell was investigated. No severe interfacial reaction and corresponding resistive secondary phase was found in the cell with LDC buffer layer, and this is due to its ability to sustain the La chemical potential in LSGM. The cell exhibited the open circuit voltage of 0.64V, the maximum power density of 223 $mW/cm^2$, and the ohmic resistance of $0.17{\Omega}cm^2$ at $700^{\circ}C$. These values were much improved compared with those from the cell without any buffer layer, which implies that formation of the resistive reaction phases in LSGM and then deterioration of the cell performance is resulted mainly from the La diffusion from LSGM electrolyte to anode.
LSGM계 전해질 지지형 고체산화물 연료전지의 특성평가
송은화,김광년,정태주,손지원,김주선,이해원,김병국,이종호,Song, Eun-Hwa,Kim, Kwang-Nyeon,Chung, Tai-Joo,Son, Ji-Won,Kim, Joo-Sun,Lee, Hae-Weon,Kim, Byung-Kook,Lee, Jong-Ho 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.5
LSGM(($La_xSr_{1-x})(Ga_yMg_{1-y})O_3$) electrolyte is known to show very serious interfacial reaction with other unit cell components, especially with an anode. Such an interfacial reaction induced the phase instability of constituent component and deterioration of the unit cell performance, which become the most challenging issues in LSGM-based SOFCs. In this study, we fabricated LSGM($La_{0.8}Sr_{0.2}Ga_{0.83}Mg_{0.17}O_x$) electrolyte supported-type cell in order to avoid such interfacial problem by lowering the heat-treatment temperature of the electrode fabrication. According to the microstructural and phase analysis, there was no serious interfacial reaction at both electrolyte/anode and electrolyte/cathode interfaces. Moreover, from the electrochemical characterization of the unit cell performance, there was no distinct deterioration of the open cell voltage as well as an internal cell resistance. These results demonstrate the most critical point to be concerned in LSGM-based SOFC is either to find a proper electrode material which will not give any interfacial reaction with LSGM electrolyte or to properly adjust the processing variables for unit cell fabrication, to reduce the interfacial reaction.
저온작동 (600∼650<sup>°</sup>C) SOFC용 복합밀봉재 제조 및 평가
임현엽,김형철,최선희,김혜령,손지원,이해원,이종호,Lim, Hyun-Yub,Kim, Hyoung-Chul,Choi, Sun-Hee,Kim, Hae-Ryoung,Son, Ji-Won,Lee, Hae-Weon,Lee, Jong-Ho 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12
A proper sealant for low temperature SOFCs should show zero or low leak rates to avoid direct mixing of the fuel and oxidant gases or leakage of fuel gas during the operation of SOFCs. Furthermore, it should be chemically and/or mechanically stable in both oxidizing and reducing environments and chemically compatible with other fuel cell components. In the present work, we developed a novel compressed seal gasket of glass-based composite reinforced with ceramic particulate particles, which can efficiently control the viscous flow of glass matrix as well as the crystallization of glass phase. This novel sealing gasket showed excellent gas tightness under very low compressive load which would be suitable for the operation of SOFCs in the temperature range $600{\sim}650^{\circ}C$.
윤경중 ( Kyung Joong Yoon ),지호일 ( Ho-il Ji ),김형철 ( Hyoungchul Kim ),손지원 ( Ji-won Son ),이종호 ( Jong-ho Lee ),김병국 ( Byung-kook Kim ),이해원 ( Hae-weon Lee ) 한국공업화학회 2018 공업화학전망 Vol.21 No.5
고체산화물연료전지(SOFC)는 전기화학반응을 통하여 연료의 화학에너지를 전기에너지로 변환하는 전력생산장치로서 다양한 연료전지 가운데 가장 높은 온도에서 작동한다. 이 때문에 높은 발전효율, 연료 자율성, 양질의 열 발생 등 고유한 장점을 지니지만 또한 고온에서 특징적으로 발생하는 열화 현상 때문에 신뢰성을 확보하는 것이 어려워서 상용화가 지연되고 있다. SOFC의 고온 열화 현상은 매우 복잡하고 다양한 요인에 의하여 영향을 받기 때문에 제품화를 위한 수명을 확보하기 위해서는 근본적인 원인을 정확히 이해하고 최적화된 대응책을 마련하는 것이 반드시 필요하다. 본 원고에서는 단전지와 스택의 구성요소별로 주요한 열화 현상을 정리하고 열화억제기술 개발 및 수명 연장을 위한 최근 연구 동향을 조사하였다.
PLD 공정으로 제조된 LSM-YSZ 나노복합체층이 포함된 경사구조 박막 공기극을 적용한 SOFC의 성능 분석
명두환,홍종일,황재연,이종호,이해원,김병국,조성걸,손지원,Myung, Doo-Hwan,Hong, Jong-Ill,Hwang, Jae-Yeon,Lee, Jong-Ho,Lee, Hae-Weon,Kim, Byung-Kook,Cho, Sung-Gurl,Son, Ji-Won 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6
The effect of the application of lanthanum strontrium manganite and yttria-stabilized zirconia (LSM-YSZ) nano-composite fabricated by pulsed laser deposition (PLD) as a cathode of solid oxide fuel cell (SOFC) is studied. A gradient-structure thin-film cathode composed of 1 micron-thick LSM-YSZ deposited at an ambient pressure ($P_{amb}$) of 200 mTorr; 2 micron-thick LSM-YSZ deposited at a $P_{amb}$ of 300 mTorr; and 2 micron-thick lanthanum strontium cobaltite (LSC) current collecting layer was fabricated on an anode-supported SOFC with an ~8 micron-thick YSZ electrolyte. In comparison with a 1 micron-thick nano-structure single-phase LSM cathode fabricated by PLD, it was obviously effective to increase triple phase boundaries (TPB) over the whole thickness of the cathode layer by employing the composite and increasing the physical thickness of the cathode. Both polarization and ohmic resistances of the cell were significantly reduced and the power output of the cell was improved by a factor of 1.6.